Is there a good Source Filmmaker forum out there?

I've been trying to teach myself how to use Source Filmmaker, and have encountered various issues. Is there a site for users that's kind of like this one, where people can get help and advice and stuff? Or is that one of those things where everyone who knows what they're doing had to independently figure everything out on their own?

Unfortunately I'm not too familiar with the SFM community at large, so I'm not sure what the current community climate is. But for any specific question you might ask, you should be able to get the answer.